Developmentally regulated activation of defense allows for rapid inhibition of infection in age-related resistance toPhytophthora capsiciin cucumber fruit

文献类型： 外文期刊

第一作者： Mansfeld, Ben N.

作者： Mansfeld, Ben N.;Colle, Marivi;Zhang, Chunqiu;Lin, Ying-Chen;Grumet, Rebecca;Mansfeld, Ben N.;Colle, Marivi;Zhang, Chunqiu;Lin, Ying-Chen;Grumet, Rebecca;Zhang, Chunqiu

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关键词： Age-related resistance; Ontogenic resistance; Cucumber; Phytophthora capsici; Plant defense; Transcriptome; Co-expression networks

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2020 年 21 卷 1 期

页码：

收录情况： SCI

摘要： Background Age-related resistance (ARR) is a developmentally regulated phenomenon conferring resistance to pathogens or pests. Although ARR has been observed in several host-pathogen systems, the underlying mechanisms are largely uncharacterized. In cucumber, rapidly growing fruit are highly susceptible toPhytophthora capsicibut become resistant as they complete exponential growth. We previously demonstrated that ARR is associated with the fruit peel and identified gene expression and metabolomic changes potentially functioning as preformed defenses. Results Here, we compare the response to infection in fruit at resistant and susceptible ages using microscopy, quantitative bioassays, and weighted gene co-expression analyses. We observed strong transcriptional changes unique to resistant aged fruit 2-4 h post inoculation (hpi). Microscopy and bioassays confirmed this early response, with evidence of pathogen death and infection failure as early as 4 hpi and cessation of pathogen growth by 8-10 hpi. Expression analyses identified candidate genes involved in conferring the rapid response including those encoding transcription factors, hormone signaling pathways, and defenses such as reactive oxygen species metabolism and phenylpropanoid biosynthesis. Conclusion The early pathogen death and rapid defense response in resistant-aged fruit provide insight into potential mechanisms for ARR, implicating both pre-formed biochemical defenses and developmentally regulated capacity for pathogen recognition as key factors shaping age-related resistance.

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